We suggest that in order to ensure progress, future research on the flipped classroom should employ
controlled studies that objectively examine student performance throughout a semester,
with both traditional and concept-inventory[35] style problems. Further, we recommend that researchers
employing the flipped classroom leverage the existing research and theoretical frameworks
to guide their use and design of in-class activities. As a side-note, we recommend that
researchers clearly describe the activities used for both in-class and out-of-class activities (this
was not always clear for studies we examined). The affordable state of recording technology and
ubiquity web-based dissemination tools make research on the flipped classroom both timely and
cost-effective.